Revetment composed of flanged units.



J. IVlGILLIVBAY.

REVETNIENT COMPOSED 0F FLANGED` UNITS.'

APPLlc AAAAAA ILED MAY 26, 1915.

1,179,121. 1 Patentempr. 11,1916.

THE COLUMBIA PLANOGRAPH co WASHINGTON, D4 c.

STABS REVETMENT COMPOSED OF FLANGED UNITS;

Specification of Letters Patent.

Patented Apr. 11,1916.

Application filed May 26, 1915. Serial No..30,482.

To all whom t may concern:

Be it known that I, JAMES MCGILLIVRAY, a citizen of the United States,residing at Sacramento, in the county of Sacramento and State ofCalifornia, have invented certain new and useful Improvements inRevetments Composed of Flanged Units, of which the following is aspecification.

This invention is in the nature of an improvement upon revetments suchas patented to me September 29, 1914, No. 1,121,018 consisting of anapron or mattress composed of reinforced concrete slabs or units joinedtogether to cover the bank or levee to be protected. It is intended tomeet the following difficulties on sand levees, namely: Waves frompassing boats or from strong winds sweep up over the mattress andpercolate through the joints between the units and then follow down justbeneath them to lower` joints where the waves in receding form a suctionwhich drawsfout the sand and in a short time an excavation is formedunder the mattress which gradually enlarges thereby allowing a sectionof the units to sink and so rupture the mattress. This is particularlythe case where through some fault in tying or other cause the units arenot brought close together.

In the present invention pockets are formed for the retention of sand orgravel over the joints between the units whereby water cannot passthrough and undermine the revetment.

The invention therefore consists in the formation of parts and in theircombination for the purpose stated substantially as hereinafter setforth and claimed.

In the accompanying drawing which forms a part of this specificationFigure 1 represents the cross section of an embankment upon which theimproved mattress is seen in edge view; Fig. 2 is a plan of one of theunits of the revetment; and Fig. 3 is a perspective view of such unit.

rIhe embankment or levee is indicated at 5 in Fig. 1 and the units ofthe protecting mattress at 6. Said units are in the form of oblongrectangular slabs each provided along its upper longitudinal edge withan upwardly projecting flange or rib 7. Each slab is provided with holes8 extending through it near the corners and with a groove 9 along one orboth ends to receive the anchoring cables 10. The slabs are tiedtogether at their ends across the cables and thereby connected to thecables which are confined in the channels formed by the grooves 9. Thecables may be anchored at one or both ends, here shown as anchored atthe upper end to dead-man, l1, the lower end having a washer 12 securedthereto at the edge of the lower slab.

The flange 7 is formed along the upper edge of the slab which edge'maybe flat while the lower edge is preferably convex to allow the slab tofit its neighbor closely and still permit adjacent slabs to lie indierent planes so that the revetments may conform closely to the surfacecovered.

The flanges of one row of slabs form a pocket with the row above whichis filled with sand and gravel 111 to protect the longitudinal jointsbetween the slabs and also the transverse j oints. With said joints thuscovered the water washing up and down the revetment cannot findy its waythrough to theI underside. Covering the oints thus also greatly reducesseepage. The flanges also greatly retard wave action thereby lesseningthe height to which these revetments need be built.

To insure greater durability in these slabs,

which are necessarily heavier than the plainv flat slabs of the patentreferred to, the reinforcing member 13 of each is not only carriedcompletely around the holes 8 and extended from hole to hole, but it isalso carried from the outside of one hole to the outside of the nextalong the side of the slab and out from the holes into lthe corners ofthe slab and close to and along the ends of the slab whereby theedges ofthe slabs are strengthened as well as the walls of the holes.

The invention claimed is:

A revetment composed of concrete slabs united together at their edges tocover the surface to be protected, said slabs having flanges integraltherewith extending along their upper edges and projecting above thesurfaces of the adjacent slabs above them whereby said flanges togetherwith the slabs above them form sand pockets over the joints between theslabs for the purpose specified.

In testimony whereof I have aflixed my signature. c

JAMES MGGILLIVRAY.

Copies of this patent may be obtained for\ve cents each, by addressingthe Commissioner of Patents. Washington, ID. C.

